Arcella vulgaris
Ehrenberg, 1832
Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Group [Vulgaroides]:
Test hemispherical; height 1/2 ~ 4/5 diam.; lacks external shelf or rim.
Species: Test 30-100 μm in diameter;
height of test about 1/2 the diameter; dome of hemispherical test evenly convex; pseudostome cicular,
central; colorless, yellow, or brown; two vesicular nuclei;
several contractile vacuoles (Kudo, 1966).
Test 100-150 μm in diameter, 50-80 high (Illustrated Guide, 1985).
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Large,
small,
smaller_1,
smaller_2 varieties
Arcella vulgaris ?,
test 53 μm in diam., pseudostome circular, 15 μm wide,
x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Arcella vulgaris ?,
test μm long, 49 μm wide, pseudostome 15 μm wide,
x 640, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
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